Filter



E. G. GUNN July l2, 1949.

FILTER Filed Aug. 9, 1945 2 Sheets-Sheet 2 l I I l I l I I HHHUIIIIIIHII R O T. N E v m ATTORNEYS ITED STATES I ATENE' HCE XPH/EEREarl G. Gunn, Providence, R. I., assigner to Fram Corporation, acorporation of Rhode Island Application August 9, 1945, Serial No.609,865 3 Claims. (Cl. 210-183) This invention relates to alter. Figure1 is a sectional view of a filter con- A filter of the type herereferred to usually structed in accordance with this invention.comprises a casingr having a center discharge Figure 2 is an elevationfragmentally broken tube extending upwardly from the bottom wall awayofamodified form. of the casing. A cartridge or some filter ele- 5'Figure 3 iS a Section 0n line 3 3 0f Figure 2. ment surrounds thiscenter tube and is sealed Figure 4 is a sectional view of fragmentalDor- 'at its upper and lower ends so that liquid to be tion of amodifled form of filter.- ltered will pass inwardly from the outer sur-This invention deals with the type of filter in face of the cartridge tothe center tube and then which liquid enters and leaves the casingthrough through some perforation in the center tube bethe bottom wallthereof. 'I'he liquid that enters tween the sealed opposite ends of thecartridge through the bOltOm Wall iS Conducted t0 the 11D- into thecenter tube for discharge per part of the filter casing and then will`flow Liquid to be filtered enters this casing at some either across theouter surface of the filter elepoint along its length so as to providethe liquid I ment to be discharged through the bottom wall to befiltered about the outer surface of the l5 0f the CaSlng in a shuntrelation to the :filter Cartridge and between the cartridge and theelement or will ow because of capillary action casing. If this liquidenters along the side of OI the difference ih'pleSSllre existent in thef ilthe cart-,ridge there may be 50m@ danger 0f the ter case about theiilter element and the disinflowing liquid, by the turbulence which itcre- Charge passage to Cause the ltrate to pass aies, washingthecontaminant which has ccuecizo throueh the filter element to a centra1conduit ed in the cartridge from the cartridge. `If the Whlch 1S atIOWeI pressure and thence will disccnduit through which this liquidenters termi- Charge through the bottom cf the alter.. prefnates low inthe casing, drainage may occur of erably, the 4conduit for the incomingllquld to the liquid from the casing when the ow of Q be filtered passesupwardly through the filter eleuid stops. In order that the liquid tc befiltered es ment So thet 1t may extend well above the rtridge. f mayenter at the upper part of the casing, addi Ca l tional constructionexternal of the casing has .Wlth fefeljehce t0 the drawlngs,partlcularly been provided in filters toconduct the oil or lgure whichShows uns mventlm? .m Connc' liquid ic bc niiered tc the upper pari cfthe casdsehrfl fgvrisrtgrrilicli, olr dliue in the base mount- 30 c ingThis is particularly tr case which has a boss H mounted thereon for edtype of filter' t mounting a base I2 which in turn serves to h. e .o Qone of the objects of t 1S mv n 1 n 1s to pr mount the lter designatedgenerally I3. A

vide a conduit from the lower part of the casing to a point above thefilter cartridge, which congopdlt I4 s cmtmectd tghthe puin? of 9% miduit will be fully contained within the casing. nca ng o sys em or. eaqmlsswri o o Another Object of this invention is to provide to be.filtered through this conduit and into the this conduit in a locationso that'it may extend ondmt l5 formed, m the has? I2' Th? boss .H

1s also provided with a conduit I6, whlch regiswell above theltercartridge.

Another object of this invention is to provide ters Wlth conduit n m thebase Whlch 1.5 con' a cartridge which will have an opening so as to 10Oued by @han Valve I8, pressed ,by Sprmg '9 receive this inlet conduitand pass therethrough t0 Closed POSIOII, and Whlch is of Just suflic1entat an advantageous location pressure so as to prevent oil from flowingback Another object of this invention is to provide Into the pressue nb01.' gallery when pressure al return opening into the Center tube at a10 has c eased to exist therein by reason of the stopping of the' engineand the circulating pump cation so that the liquid to be filtered willpass a drive thereb A conduit 2u is als provided in substantial axialdistance along the cartridge n y' o b t th d f th l t d .t d th the bossIl, which registers wlth a conduit 2| e Ween e en o e m e con u1 an e inthe base for thereturn cw of clean oil which entrance to the returnpassage, whereby circulahas been ltered tion of warm oil across thecartridge will be pro- The casing 22 of lthe lter is mounted upon vided.the base by suitable bolts 23, which pass through This invention isapplicable both to the strap the intumed nange 24 of the .case and serveto mounted and base mounted lter, although it Sea] the casing on thebase by gasket 25, Cenhas greater advantage in the base mounted filterter tube 26 stands upwardly from the base and as it provides a verydefinite Saving in oonstruoconnects withthe conduits 2i-20 for dischargeti-on in this filter. of the filtrate lubricant. l

With these and other objects in view, the in- A standpipe 21 standsupwardly from the base vention consists of certain novel features ofconand is in communication with the conduits struction, as will be morevfully described and par- I4-l5 heretofore described. The filter elementticularly pointed out in the appended claims. 00 30 is of any suitableform, that here shown being of aplurality of discs of two diiermt *esand has a central opening for the reception of the center tube 26 and issealed therewith at its upper end by gasket 3| and at its lower lend bygasket 32. This lter element has an opening 28 for the reception o! astandpipe 21 supported by base I2. The cover 33 closes theliilter casing22, and a spring 34 acts between this cover and the filter element forpositioning it against the support 35 standing upwardly from the base.With the standpipe 21 extending through the iilter cartridge it may belocated well above the cartridge into the hollow 36 of the cover againstwhich the entering liquid may strike to be baffled in either direction.

Lubricant to be ltered enters through the conduit I4-I5 and passesupwardly through the standpipe 21 to the upper part of the casing andsurrounds the lter element with the lubri-- cant to be filtered. Afterlubricant enters and fills the case, pressure will build up and the ballvalve I8 will be depressed and some of the lubricant will flow outwardlythrough the passage I1|6. The lubricant which is contained in the casingand is encircling the filter element 30 will be under certain pressureand will be in a shunt relation to the direct flow of lubricant to thepressure rib. The conduits 2li-2|, which connect to the crankcase sump,will be under no pressure and thus the lubricant which is to be filteredwill pass through the lter element to its central opening and thencethrough openings 31 into this central conduit 26 and thence to the sump.Should the engine stop and the oil pump stop, the -ball valve I8 willreturn to its seat and maintain the casing with liquid to be iiltered upto the level of the opening 31, ready for a repetition of the abovedescribed operation when circulation is again established, thuspreventing the casing filling with air which must be expelled beforeproper filtration can start. Should the lubricant become cold andsomewhat thickened because of reduced temperature, as soon as pressureis reestablished flow across the lter element will occur from the top ofthe tube 21 to the exit opening through ball valve I8 thus warming theentire mass of oil quickly in the casing and when the temperature issuch that filtering will again occur, the reestablishment of ltratepassingthrough the filter element will take place.

In the modiiied form of the invention, the casing 40 is mounted by meansof strap 4I held in tight engagement with the casing by a bolt 43 andhaving flanges 42 to mount it upon some suitable support. The casing isof generally cylindrical form and is closed by removable cover 44,sealing with the top edge of the cylindrical wall by means of a gasket45, with bolt 46 to hold the cover on the center tube in a mannersimilar to that described in connection with Figure 1. The bottom wall41 is provided with a drain plug 48 and inlet sleeve 49 shouldered as at50 to engage the outer surface of the bottom wall. The standpipe I inthis form of the invention is fixed to the filter casing by m'eans ofthis sleeve 49 and extends upwardly throughout the axial extent of thecylindrical casing. The lter element, designated generally 52, in thisinstance is provided with registering openings in the leaves or discsfor the reception of the standpipe 5I. The end plates 53 at the bottomand 54 at the top are also provided with openings for the reception ofthe standpipe. A by-pass may be provided at the lower end of the iilterelement, designated 56, or some by-pass connection may be connected inplace of the drain plug 4B.

In the modified form shown in Figure 4 a short pipe 60 extends upwardlyfrom base I2 and `terminates at its upper end in an inward taper elementwill have, as a permanent part thereof,

its portion 63 of the standpipe to engage the section 60 which is iixedto the base I2. This construction is adaptable either to the basemounted filter case 22, as shown in Figure 1 or the strap mounted case40 as shown in Figure 2.

I claim:

1. In a iilter, a casing, an entrance conduit into the casing throughthe bottom thereof and extending axially within the casing upwardly to apoint adjacent the upper end of the casing, a discharge conduitthroughthe bottom to the outside of the casing, a iilter element in saidcasing, and through which the liquid to be filtered passes, a separateconduit which opens within the element to conduct the iiltrate from theelement through the casing, a check valve in said discharge conduit heldclosed during normal ltering operation but opened in response topredetermined pressure for by-passing said element, said entrance anddischarge conduits being spaced axially of said element adistance tocause traverse of the liquid along said element' upon development ofsaid predetermined pressure, whereby warming of the element may occur byuniiltered liquid passing through said conduits.

2. A iilter as claimed in claim 1 wherein the separate conduit has anentrance opening which is located adjacent the upper end of the casingwhereby to maintain the liquid in the casing to the level of the lowerof the entrance or discharge conduits.

3. A i'llter as claimed in claim 1 wherein the entrance conduit into thecasing extends through the element.

EARL G. GUNN.

REFERENCES CITED The following referenlces are of record in the le ofthis patent:

UNITED STATES PATENTS Number Name I Date 1,703,335 Bower Feb. 26, 19291,723,945 McCutcheon Aug. 6, 1929 1,780,663 Winslow et al. Nov. 4, 19301,948,479 Caminez Feb. 20, 1934 2,017,232 Brown Oct. 15, 1935 2,132,770Weidenbacker Oct. 11, 1938 2,145,304 Hill Jan. 31. 1939 2,203,495Kamrath June 4, 1940 2,253,684 Burckhalter Aug. 26, 1941 2,253,685Burckhalter 1 Aug. 26, 1941 2,275,481 Wilkinson Mar. 10, 1942 2,390,539Katcher Dec. 11, 1945 2,429,321 La Brecque Oct. 21, 1947

